Three commands have been promoted from the pg-extras CLI plugin to the CLI proper. heroku pg:ps lists currently running queries, while pg:kill and pg:killall can cancel those queries. Full documentation is in the Heroku Postgres article.

Rather than specifying the full URL of a database to --fork and --follow from another app, you can now pass an argument of the form appname::HEROKU_POSTGRESQL_COLOR_URL. More information on fork and follow can be found in their respective articles.